P0131

129002 - P0131

Information saved in
DME

Fault code
129002 - P0131

Fault text
Oxygen sensor before catalytic converter, signal lines: Short
to earth

Fault description
The diagnostic function monitors the messages of the
internal oxygen sensor chip.

Condition for fault identification
Test condition:
The fault is recognized by the self-diagnosis.
Potential problem source(s):
- Defect in wiring harness to pre-catalyst oxygen sensor
- Oxygen sensor before catalytic converter defective
- Defective DME
Terminal condition: none
Voltage condition:
- None
Temperature condition:
- None
Time condition:
- 1 sec.
Other conditions:
- Engine on
- No additional diagnostic fault codes logged

Condition for fault memory entry
This fault is logged in the control module's fault memory if
it remains present for longer than 0.5 sec.

Action in service
- Defect in wiring harness to pre-catalyst oxygen sensor
- Replace pre-catalyst oxygen sensor
- Replace DME

Fault effect and breakdown warning
Breakdown notice:
- none
Possible apparent symptoms:
- none

Driver information
Warning light:
- ECE emissions warning lamp: on
- US emissions warning lamp: on
- ECE electronic engine power reduction: off
- US electronic engine power reduction: off
- CC message: none

Service instruction
- none